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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd3339a16bc5544fac1eb232681bd63ec48afd81abd909111e21b5061eaeac11' 
  AND token = '3PKfGXWI5Q/ebgrLCpvXx3RFbBkiWgLZLP47ufzF/Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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