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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7b6df75a2dcccb7a3762bc128a217da9d283085556c45a99b7a53657013594f' 
  AND token = 'idwiQjfF6Q1LKXafJNBrzo/X3JtMIicU4g/2lCxNy6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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