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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77085ecd8b67c180386408eb4eeeb16ebe2c2691e6dcbc2142bd17a219096338' 
  AND token = 'GKMFU9o96S6H00D+XXytaL+cx4tH0LQz/CEfKxk31V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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