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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5a29a53bb6749e1b0bf457ad9cf58795c4b6281d731a22bff74e3cf06acb582' 
  AND token = '/TUy6Ck32XPxe9GbGhwJr5U/J7OYM329PLZSO9twb2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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