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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fb4aff707cc21ead5d160f7bdd363cf4cfbb5b5764e87c8f8f5dfb8372009c8' 
  AND token = 'zKLNJKYxYnn1JRCXbw68vJMMoboqHnqxWc8ylR0O9AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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