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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d2dbedbc329ffad0cafd0e8a25a9f70c9051ad69701003896d148f0c52f1567' 
  AND token = 'f/1Id+K0iAceTLbdCCEg1CFKzHUTFYjiLNelrVeXCvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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