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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f662da495491e5a1c3050cf343e8ad30c26459df9d0a38a0221314c655bcf67a' 
  AND token = 'j54E9s2G4+oAYaI1s+hB4lduXn3jBP1rZNzIsvem6bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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