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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2c022c8c271d395ccea473d65de96d396312965e670f9efddcff4ac66cb5f8f' 
  AND token = 'sM2ci2TuWwsREQ7wCGn4oiswARskCgEMiy2T+zaKzBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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