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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7be1e7fbbd707870d1c47cdefb4c1b2f4030e585cf9b5c1f42b2777b6e639d90' 
  AND token = 'BpR5HEBJPJVIosa6r4KBPIBtfL/cBwcJws93I3JM0tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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