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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96d6e8fbff0dbe244099534904f47ab00dedd4799781335397d110e1a8a0f9cd' 
  AND token = '2fJeIRi3VSHE3CmE0yJdbI/DUK94lB74zq5BoiqZrog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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