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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c50359a5477828083abe2c79bf76c31761f2d648b898d8b911ebaa98bfe122c' 
  AND token = 'jx4sBo8gfQVpRFji7/3fmI2PiDikkEM2237HLuAmkXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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