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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f243dbeebb77e9a9ff51e406821c11c5ebaa4c749cc51cd31c9f3adbb5ffbd6' 
  AND token = 'rtQRXySQMKoB6XmwFp04Pr9Op63ROODztgXPNcJgOV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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