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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '599d78160f2ded367c0342fed572beee81d14ba0660abcffc7df7282455d701c' 
  AND token = '2wHfTdrYm3mYz1zqIil6yqdNw4YArh4baB0wCSQN0Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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