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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '156d3b6dfc265e4ab675e66f89c14c0e9d81fcaf96de2d1eca1fa3549146775c' 
  AND token = 'vnyIgNSaTZf5ObuOVa7kWnoEFdaysrmD2ftaWcft4Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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