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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0e309e9a0f442d73ea946105738475280d162f51d0a230c7a3b02d9ae405905' 
  AND token = 'glYNi+8p4NVPjtIlXp4dIvrX1T2st+FfZ+i0Hz/KFaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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