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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b532c253d59ece17e9a3ecb2bd09a659244d134252d53d340eb54332d5165d8' 
  AND token = 'Kdc4SZQsVZOHy+LIazCHRyjNJLv7AhhVHAG1LUKNAAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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