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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61b4ce0be709258d4ede2ce86bf7d07906a972e2e3056b0fc90e2f0e1d6ddda6' 
  AND token = 'NlM4s4RBgO8sxN4I2waQbSbeNCJWZRYYG0Vre+JH4pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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