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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89a09af591b2b0c0be52ee03cb3024226d83504c949044be20266fd2073e8fb0' 
  AND token = 'S4sUrp8NbN9q2QoMeeLUfEty2LLrkh0ZNOHRSMLhOQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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