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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f7b7a128ff891bcbe22abb1737a80ac14236bbdae50a1a9195dfcfddd3e7947' 
  AND token = 'lGz9lK+cyW6EOnM8M2hUZjoGSWfMx5SW6JM93fovfZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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