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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9e7e34f7222510f97e6f5cdbe52c4350affbe1df6c2ddd3ff24699966174a65' 
  AND token = '3i1qduduNeawk2wejxAKE0X+WCjGg61Tkr+A+CHXd8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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