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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90bf8b54c1a9b870091cfe2e7d4cf512e71971b10f8ac297231ad827f469f974' 
  AND token = 'swEMBc51gulvUm+thnu9wJqauXa4AFwisF3F1EMVx2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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