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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0944d24ba26e8d4e9a26ef91888c56cff61f2f5b29e6ca23ae94d3ce71d8a64' 
  AND token = '7yLqZ4FTsgFVd45GCINmG9Q0aZNzwqbLlKSmtGFElqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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