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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aafea0a758d66e13a5ce059035ea6020dffb60234cd8b14e7ce18f3b5fe57785' 
  AND token = '2vXt8UJfCO4YNKfkPvwheykptQXVMbq22p+Prrl2zHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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