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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0b04c30bdfcfc2067420939f710792b6a79928d54e01329f1d7239e3ac77e7a' 
  AND token = 'gwee5O4hsYr3KRG1SDMhlJOgCbi4bZ+I9mhG7n2O0Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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