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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c22a837b2cc79c9812468cc885168afa79d24bc37024a0a4eed6ca7f90fa9676' 
  AND token = 'HN5bokL+4DRiNrnK8NgvjrFg6G7QRQWWZckgzxO/9FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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