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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'deea4d49a1829f7de08469114ea7e7093d397dfc4c1997d34093ee993c3889ea' 
  AND token = 'eXcJx4gEMt4wu5ktCLgygQujvDisIlbm9ZWlpJj+UG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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