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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c2dae873d19710af986fe5624f05666437f7a6f41599f2b02becec9fde0c2b9' 
  AND token = 'O9YmOPkhFc2Is/QD3IrUgTpSGOHgc6NEYeQ8PM7zvdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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