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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f33d8ee228f73f8acc3f048ac522c028b6c98de51026c92aa35df997e9d5aa62' 
  AND token = 'ZrqQSOlO1SF08Y8GWIvKyC8tvcSohHXm3rSe98aHDO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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