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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bed48e32e1d55c3626c3824e69927fcf7e6729297053943bdfd56c2122454ed' 
  AND token = 'ERHtsAXRW3waBwEwQTuw1rEeeu49VAHJ2VSR0JLlz4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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