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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87278beafb7565301a877e6320d6416beee1d4c97ca805e7792407b75250e7d6' 
  AND token = 'Bp4ATobqjKrIMV2f9zzrMX/zwhUveoWM5DC9L2DEPkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}