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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3e189737401ef2d0a2e07cff0646acc13ddaef86559d618268ea80fd61816c6' 
  AND token = 'fmYRBk6/ESUvRup2Srm1iYCAMjk+6G/phCj8VPgH2Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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