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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1c6a49f6d956c3badc2952ee45cc5239d73a934f2a18dc8d020c7f8fefb5a5e' 
  AND token = 'XOrVkGmIZIyeK677pq6IM3YFx2MolJYFernCJKEg838=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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