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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd139b2e6a5da3832348c46e9727f51b44dc92426bfe254b1323dbd824b3ee09' 
  AND token = '4Txa+tUhWc131yDNJc+X5mBjg4KJPjIozZcS5A+7HaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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