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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e0d11b747b7a9c05b1a3a9ca4ef455c0209dc11cedf14d7710ba7786ae3a7a1' 
  AND token = 'BjLYv6sm3RO2r6+i3S2yIX6RmrGzh8iktT1indiP6Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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