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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40910740c1bc2958e69a120e792b1a0e03b12e20c8748c1bb9aca46a9b0d748c' 
  AND token = 'YQvBDGQHe6iujdF4z/y+/nPI9HZdnd7zqlkJcIUQEe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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