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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50065b6f9be56287c0386da0190cf95d46f0c13022134a7f46639059d5ac72e2' 
  AND token = 'TrQF+f3Zr13nZ0QUq9sEY9azEK8nDUg5+Ec81a/NOf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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