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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dd910733a810904c5615a7930c2d494bec52291a46fc2db24501902d3619187' 
  AND token = 'jEoHQ4NF0n9eboEqqb8Dx2NBvldeOJiWHa2RaBqphzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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