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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff07c26216cf46e6f8de9cd16d932a94f4343d8411af2f0650bf5e222a09cbff' 
  AND token = '4rkA3ywKdmfEQsWe6i6iUsJwIGWNzztSF477M6NLwg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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