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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9a50ccfa648680e5b26847544cae21b3c1b218c4337d31150c557b5db50d271' 
  AND token = 'o8NZysAKu4wZ4yDuKjyZdMQ32+mTK/UVszr1eP3/O8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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