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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e46e5f9215a00fa0e4a2d7f80476d35f082932aa13e41ea8456c4eb5c29c20d' 
  AND token = '/iYZJV3MkO+4WgTT16fSzepvRDAMzZYWESfwRYaK958=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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