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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7cc2c499f462f892378d3ffaf6fb04c9103afcbafe6ae180538744ac621fc02' 
  AND token = 'mT2jmAoQmyJMaw0a2JL1p6ZuQoS/8mxTyF0aM0SXw8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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