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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d383bc48e8db24e7070a865ccc02057a6390536d042d3179d6a3b6de06235b6' 
  AND token = '6lp+6daEOGatfcHne4+w+E1D9fuz3yWJ1UZK42oS0T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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