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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7db8f936fae443839c06ee1053cc3cfb5acc39d19458c9b78f6a5b0bcdcbf1d7' 
  AND token = 'tv1ZinX5pqXGIeBjECx0N0mzLutLI+FklVamIgQxRHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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