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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c3313592291645915aba6749c18eb619ab515fc50d25b39fd31efa195b6004e' 
  AND token = '1qJtrqpoBC5XFPhEBLoCWf7m99pwDn1fHb0RtNnnkq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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